Morris Plains is a borough in Morris County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,532, reflecting an increase of 296 (+5.7%) from the 5,236 counted in the 2000 Census, which had in turn increased by 17 (+0.3%) from the 5,219 counted in the 1990 Census.
Morris Plains was incorporated as a borough by an act of the New Jersey Legislature on March 15, 1926, from portions of Hanover Township, based on the results of a referendum held on April 15, 1926. The borough's name comes from Lewis Morris, colonial governor of New Jersey.
Morris Plains serves as a bedroom community, with many residents traveling to work in New York City. The Morristown Line of New Jersey Transit provides commuters with direct access to New York Penn Station and to Hoboken Terminal.
The borough has been a major base of operations for Pfizer, previously the headquarters for Warner-Lambert. Pfizer has sponsored the Health and Medical Science Academy at Morristown High School and an annual 5k race around Morris Plains. In 2012, a 63-acre (25 ha) property owned by Pfizer on the west side of Route 53 was acquired by M&M Realty Partners, which plans to redevelop the site for a mixed use development that would include 500 housing units and 100,000 square feet (9,300 m2) for retail use.(Wikipedia)